bshell: re-organise build into three separate components

bshell: the front-end binary
bshell.runtime: contains the parser, compiler, and classes needed to run bshell scripts
bshell.core: contains the builtin commandlets and aliases

bshell.runtime/parse/parse.c

@@ -0,0 +1,55 @@
+#include "syntax.h"
+
+#include <bshell/ast.h>
+#include <bshell/parse/lex.h>
+#include <bshell/parse/parse.h>
+#include <bshell/parse/token.h>
+#include <stdio.h>
+#include <string.h>
+
+enum bshell_status bshell_parse_ctx_init(struct bshell_parse_ctx *ctx, struct bshell_lex_ctx *src)
+{
+	memset(ctx, 0x0, sizeof *ctx);
+
+	ctx->p_src = src;
+
+	return BSHELL_SUCCESS;
+}
+
+void bshell_parse_ctx_cleanup(struct bshell_parse_ctx *ctx)
+{
+}
+
+struct bshell_ast_node *bshell_parse_ctx_read_node(struct bshell_parse_ctx *ctx)
+{
+	parse_symbol(ctx, BSHELL_SYM_SEMICOLON);
+	parse_linefeed(ctx);
+
+	struct bshell_ast_node *result = NULL;
+	bool ok = parse_statement(ctx, &result);
+
+	return ok ? result : NULL;
+}
+
+void report_error(struct bshell_parse_ctx *ctx, const char *format, ...)
+{
+	ctx->p_status = BSHELL_ERR_BAD_SYNTAX;
+	fprintf(stderr, "PARSE: ");
+
+	va_list arg;
+	va_start(arg, format);
+	vfprintf(stderr, format, arg);
+	va_end(arg);
+
+	fprintf(stderr, "\n");
+
+	struct bshell_lex_token *tok = peek_token(ctx);
+	fprintf(stderr, "  peek_token = ");
+#if 0
+	if (tok) {
+		print_bshell_lex_token(tok);
+	} else {
+		fprintf(stderr, " EOF\n");
+	}
+#endif
+}